Arsenal manager Arsene Wenger has made one change from the side that defeated Sunderland 3-1 at the weekend for this evening's crucial Champions League Group F match at Olympiacos.

Forward Theo Walcott returns to the starting XI, as Alex Oxlade-Chamberlain drops to the substitutes' bench, alongside academy youngster Alex Iwobi.

Olivier Giroud continues up front for the Gunners, while Joel Campbell and Mathieu Flamini retain their places in the starting XI, as Alexis Sanchez and Santi Cazorla remain absent through injury.

Hosts Olympiacos name former West Bromwich Albion striker Brown Ideye up front, while Pajtim Kasami is preferred to Esteban Cambiasso in midfield.

Olympiacos: Roberto; Elabdellaoui, Da Costa, Siovas, Masuaku; Kasami, Milivojevic; De Freita, Fortounis, Pardo; Ideye
Subs: Botia, Finnbogason, Dominguez, Salino, Kapino, Fortes, Cambiasso

Arsenal: Cech; Bellerin, Mertesacker, Koscielny, Monreal; Ramsey, Flamini; Campbell, Ozil, Walcott; Giroud
Subs: Ospina, Debuchy, Gibbs, Gabriel, Oxlade-Chamberlain, Chambers, Iwobi

Keep up to date with all the action from this evening's clash with Sports Mole's live text commentary here.